磷脂酶A_2在腰腿痛发病中的可能作用

The possible role of phospholipase A_2 in low back and leg pain

目的 :探讨磷脂酶 A2 在腰腿痛发病中的可能作用。 方法 :在大鼠的硬膜外腔注射磷脂酶 A2 ,然后对马尾神经根的病理变化及背根节和脊髓后角中 P物质 (substance P,SP)的变化进行观察。 结果 :磷脂酶 A2 注射到大鼠的硬膜外腔后可引起其马尾神经根的神经纤维产生明显变性和脱髓鞘改变 ;腰 4～ 6背根节中 SP阳性神经元的数目和面积明显增加 ,脊髓背角浅层中 SP阳性神经纤维终末的面积也明显增加。统计学分析证实与生理盐水对照组相比较有显著性差别 (P<0 .0 5 )。结论 :磷脂酶 A2 是一种对马尾神经有伤害作用的物质 。

Objective:To study the role of phospholipase A 2 in the pathomechanism of low back and leg pain. Methods:Phospholipase A 2 was injected into rats′ cavum epidurale, then the pathologic changes of cauda equina was viewed under light microscopy and electronic microscopy. The substance P(SP) in the dorsal root ganglia(DRG) and spinal cord was determined by immunohistochemistry. Results:After phospholipase A 2 injection, the nerve fibers of cauda equina displayed significant degeneration and demyelination. In L 4 to L 6 segment, the number and area of SP positive neurons in the DRG increased significantly. The relative density of positive nerve endings in the dorsal horn of spinal cord was also increased significantly. There were significant difference compared to the normal solution control group by statistic analysis. Conclusion:Phospholipase A 2 is a nocuous substance to cauda equina. It may play an important role in the pathomechanisms of low back and leg pain related to lumbar disc herniation.